Defensive function of herbivore-induced plant volatile emissions in nature.
Volatile emissions from Nicotiana attenuata were quantified during feeding by larvae of Manduca quinquemaculata, the mirid Dicyphus minimus and the chrysomelid Epitrix hirtipennis, in the field in Utah. Three compounds (cis-3-hexen-1-ol, linalool and cis-α-bergamotene) increased egg predation rates by a generalist predator. Linalool and a mixture of all 3 compounds decreased oviposition by Lepidoptera. It is concluded that release of volatiles resulted in a decrease in the number of herbivores of more than 90%.